Pick for mining-machines



(No Model.)

G. D. WHITOOMB.

PICK FORMINING MACHINES.

Patented July 3, 1888.

Ina en o I" minesses 0M 0 7 7v W j, v e m. G

n Washin UNITED STATES GEORGE 1). WHITGOMB,

PATENT OFFICE.

OF CHICAGO, ILLINOIS.

PICK FOR MINING-MACHINES.

SPECIFICATION forming part of Letters Iatent No. 280,541, dated July3,1883.

Application filedNoven ber 10. 1882. (No model.)

To ail whom it may concern Be it known that I, GEORGE D. WHITCOMB, acitizen of the United States, residing at Chicago, in the county ofCook, in the State of Illinois, have invented a certain new and usefulImprovement in Picks for Goal-Mining Machines, which .is fully set forthin-the following specification, reference being had to the accompanyingdrawings, in which-- Figure 1 is a side view of my improved pick. Fig. 2is a section on the line as w in Fig. 1, showing one edge of the pick.Fig. 3 is a section 011 the same line, showing the other or oppositeedge.

The same letters denote the same parts in all the figures.

My invention relates to picks for use in coal-mining machines. In myPatent No. 232,792, dated September 28, 1880, I have described a form ofpick for this purpose which I find to be well adapted to the ordinaryuses of coal-mining. Experience shows, however, that it is desirable amining-machine should be provided with a variety of picks adapted todifferent kinds of strata and to cutting passages of different shapes;but coal differs in different mines, and sometimes the strata to be outare of a tough nature and will not fracture freely under the blow of thepick, in which case the use of a pick of the form shown in the patentabove named will result in leaving a cuttingface diversified by deeppockets and jagged proj ections, and on subsequent strokes the pickglances off from the points of the latter and sticks in the pockets.\Vhen the material to be wrought is of this nature, I find it useful toemploy a pick such as I will now proceed to describe.

The general conformation of the pick is the same as that described inthe patent referred to; but in place of one of the points I make anearly straight edge, B, rather less than an inch long, its directionbeing nearly at right angles to that of the V-shaped edge A, which joinsthe two points. At its other end this V-shaped edge terminates in apoint, C.

In use the pick may be arranged with the short edge B either uppermostor at the bottom of the out, according to the location of the hardermaterial which it is designed to act upon. In operation this short edgestrikes against the jagged points of the uneven face, and, acting inconjunction with the vertical V- shaped edge, will hold the pick in thedesired position and prevent'glancing.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A chisel-pick having a front edge receding from each of its endstoward the middle, and having at one of these ends a short edgetransverse to the plane of said front edge, substantially as and for thepurpose described.

2. Apick having the notched chisel-edge A, with the point C at one ofits ends and the transverse edge B at the other, substantially as andfor the purpose described.

GEO. D. WVHITOOIWIB. Witnesses:

Jim. 0. MACGREGOR, THOMAS H. PEASE.

